@import '../../variables.less';
@import 'mediawiki.mixins.less';

/* Variants and Actions */
.vector-menu-dropdown {
	direction: ltr;
	float: left;
	cursor: pointer;
	position: relative;
	line-height: 1.125em;

	h3 {
		color: @color-base--subtle;
		position: relative;
		display: block;
		.box-sizing( border-box );
		// `padding-top` needs to scale with font-size.
		padding-top: 1.25em;
		padding-left: 8px;
		padding-right: unit( 24 / @font-size-tabs / @font-size-browser, em );
		font-size: @font-size-tabs;
		font-weight: normal;

		&:after {
			content: '';
			background-image: url( images/arrow-down.svg );
			background-position: 100% 50%;
			background-repeat: no-repeat;
			position: absolute;
			top: unit( 10 / @font-size-tabs / @font-size-browser, em );
			right: 8px;
			bottom: 0;
			width: unit( 16 / @font-size-tabs / @font-size-browser, em );
			// Modify the color of the image from the default #202122 to approx. #404244 to match the text.
			opacity: 0.84;
		}

		&:hover,
		&:focus {
			color: @color-base;

			&:after {
				opacity: 1;
			}
		}
	}

	// The menu itself.
	.vector-menu-content-list {
		background-color: @background-color-base;
		list-style: none none;
		// Match the width of the dropdown "heading" (the tab)
		min-width: 100%;
		position: absolute;
		top: 2.5em;
		left: -@border-width-base;
		margin: 0;
		border: @border-width-base @border-style-base @border-color-base;
		border-top-width: 0;
		padding: 0;
		box-shadow: 0 1px 1px 0 rgba( 0, 0, 0, 0.1 );
		text-align: left;
		opacity: 0;
		visibility: hidden;
		.transition( opacity 100ms );
		z-index: @z-index-menu;
	}

	&:hover .vector-menu-content-list,
	.vector-menu-checkbox:checked ~ .vector-menu-content .vector-menu-content-list {
		opacity: 1;
		visibility: visible;
	}

	li {
		padding: 0;
		margin: 0;
		text-align: left;
		line-height: 1em;

		a {
			color: @color-link;
			display: block;
			padding: 0.625em;
			white-space: nowrap;
			cursor: pointer;
			font-size: @font-size-tabs;
		}
	}

	.selected a,
	.selected a:visited {
		color: @color-link-selected;
		text-decoration: none;
	}
}

#mw-head .vector-menu-dropdown h3 {
	// Tab separator: Outer end (right in LTR) border of "Actions" menu.
	background-position: right bottom;
	float: left;
	height: unit( 40 / @font-size-tabs / @font-size-browser, em );
	margin: 0 -@border-width-base 0 0;
	// `padding-right` >= `1px` effectively moves the "background border" outside of the element to
	// act like a real border. It is necessary for `.vector-menu-dropdown .vector-menu-content-list` dropdown to align well.
	// 0.5em equals `8px` at computed `font-size` of `14px` as visually harmonically with
	// `padding-left` in `.vector-menu-dropdown h3 a`
	padding-right: unit( 24 / @font-size-tabs / @font-size-browser, em );
}

// Tab Separators
// `.vector-menu-tabs`: Outer start border (left in LTR) of tab row.
// `.vector-menu-tabs a`: Border between tabs and outer end (right in LTR) border.
// `#mw-head .vector-menu-dropdown h3`: // Outer end (right in LTR) border of "Actions" menu.
.vector-menu-tabs,
.vector-menu-tabs a,
#mw-head .vector-menu-dropdown h3 {
	// Support: IE 9, which doesn't understand `linear-gradient`.
	background-image: url( images/tab-separator.png );
	background-image: linear-gradient( to bottom, rgba( 167, 215, 249, 0 ) 0, @border-color-content 100% );
	background-repeat: no-repeat;
	// Contain gradient to 1px × 100% size and draw from top to bottom-left or -right corner.
	background-size: @border-width-base 100%;
}

// Invisible checkbox covering the dropdown menu handle
.vector-menu-checkbox {
	cursor: pointer;
	position: absolute;
	top: 0;
	left: 0;
	z-index: @z-index-menu-checkbox;
	opacity: 0;
	width: 100%;
	height: 100%;
	margin: 0;
	padding: 0;
	// Hide the checkbox completely in browsers that don't support :checked
	display: none;

	:not( :checked ) > & {
		// When the browser supports :checked, display it
		display: block;
	}

	&:checked + h3:after {
		transform: scaleY( -1 );
	}

	&:focus + h3 {
		// Simulate browser focus ring
		outline: dotted 1px; // Firefox style
		outline: auto -webkit-focus-ring-color; // Webkit style
	}
}
